ROCK

rock-202602260000912562false00009125622026-02-262026-02-26

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) February 26, 2026 (February 26, 2026)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On February 26, 2026, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and twelve months ended December 31, 2025. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on February 26, 2026

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:February 26, 2026 By:/s/ Joseph A. Lovechio Joseph A. Lovechio Vice President and Chief Financial Officer

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rock-202601210000912562false00009125622026-01-212026-01-21

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) January 21, 2026 (January 21, 2026)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition On January 21, 2026, Gibraltar Industries, Inc. (the “Company”) issued a news release announcing select preliminary estimated unaudited consolidated financial results from continuing operations for the three and twelve months ended December 31, 2025. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Preliminary Results Release issued by Gibraltar Industries, Inc. on January 21, 2026

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2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:January 21, 2026 By:/s/ Joseph A. Lovechio Joseph A. Lovechio Vice President and Chief Financial Officer

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rock-202510300000912562false00009125622025-10-302025-10-30

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) October 30, 2025 (October 30, 2025)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On October 30, 2025, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and nine months ended September 30, 2025. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on October 30, 2025

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:October 30, 2025 By:/s/ Joseph A. Lovechio Joseph A. Lovechio Vice President and Chief Financial Officer

3

rock-202508060000912562false00009125622025-08-062025-08-06

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) August 6, 2025 (August 6, 2025)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On August 6, 2025, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and six months ended June 30, 2025. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on August 6, 2025

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:August 6, 2025 By:/s/ Joseph A. Lovechio Joseph A. Lovechio Vice President and Chief Financial Officer

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rock-202504300000912562false00009125622025-04-302025-04-30

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) April 30, 2025 (April 29, 2025)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On April 30, 2025, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three months ended March 31, 2025. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 8.01 Other Events On April 29, 2025, the Board of Directors of the Company authorized a share repurchase program, pursuant to which the Company is authorized to repurchase up to $200 million of the Company's issued and outstanding common stock over a three-year period ending April 30, 2028. Repurchases of common stock under the repurchase program may be made, from time to time, in amounts and at prices the Company deems appropriate, subject to market conditions, applicable legal requirements, debt covenants and other considerations. Any such repurchases may be executed using open market purchases, privately negotiated agreements or other transactions, and may be funded from cash on hand, supplemented by available borrowings under the existing credit facility.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on April 30, 2025

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:April 30, 2025 By:/s/ Joseph A. Lovechio Joseph A. Lovechio Vice President and Chief Financial Officer

3

rock-202502190000912562false00009125622025-02-192025-02-19

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) February 19, 2025 (February 19, 2025)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On February 19, 2025, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and twelve months ended December 31, 2024. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on February 19, 2025

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2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:February 19, 2025 By:/s/ Joseph A. Lovechio Joseph A. Lovechio Vice President and Chief Financial Officer

3

rock-202410300000912562false00009125622024-10-302024-10-30

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) October 30, 2024 (October 25, 2024)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On October 30, 2024, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and nine months ended September 30, 2024. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers (d) On October 25, 2024, Gibraltar Industries, Inc. (the “Company”) appointed James S. Metcalf to the Board of Directors of the Company, effective immediately. Mr. Metcalf will serve on the Capital Structure and Asset Management and the Nominating, Governance, and Corporate Social Responsibility Committees.

As a member of the Company’s Board of Directors, Mr. Metcalf’s compensation will consist of an annual cash retainer equal to $95,000 and an annual grant of shares of the Company’s common stock having an aggregate value of $115,000 under the Company’s Amended and Restated 2016 Stock Plan for Non-Employee Directors. Pursuant to the terms of the Company’s 2015 Management Stock Purchase Plan, Mr. Metcalf has the right to defer the receipt of his cash retainer, and any such cash deferral will be used to acquire restricted units equivalent to shares which will be payable to Mr. Metcalf in cash following the termination of his Board service. In addition, pursuant to the terms of the Company’s Non-Employee Director Stock Deferral Plan, Mr. Metcalf has the right to defer the receipt of the shares of the Company’s common stock which he is entitled to receive and instead receive deferred share units, which are converted to shares and issued six months after termination of his Board service.

The press release announcing the appointment of Mr. Metcalf is filed herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on October 30, 2024

99.2 News Release issued by Gibraltar Industries, Inc. on October 30, 2024

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2

SIGNATURES

Pursuant to the req

rock-202410110000912562false00009125622024-10-112024-10-11

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) October 11, 2024 (October 11, 2024)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition On October 11, 2024, Gibraltar Industries, Inc. (the “Company”) issued a news release announcing select preliminary estimated unaudited consolidated financial results for the three months ended September 30, 2024 and providing updated guidance for the twelve months ending December 31, 2024, along with the date for its third quarter conference call. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K, including the Release, is furnished pursuant to Item 2.02 of Form 8-K and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 News Release issued by Gibraltar Industries, Inc. on October 11, 2024

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2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:October 11, 2024 By:/s/ Joseph A. Lovechio Joseph A. Lovechio Vice President and Chief Financial Officer

3

rock-202407310000912562false00009125622024-07-312024-07-31

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) July 31, 2024 (July 31, 2024)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On July 31, 2024, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and six months ended June 30, 2024. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on July 31, 2024

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2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:July 31, 2024 By:/s/ Jeffrey J. Watorek Jeffrey J. Watorek Vice President and Treasurer

3

rock-202405010000912562false00009125622024-05-012024-05-01

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) May 1, 2024 (May 1, 2024)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On May 1, 2024, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three months ended March 31, 2024. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on May 1, 2024

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2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:May 1, 2024 By:/s/ Jeffrey J. Watorek Jeffrey J. Watorek Vice President and Treasurer

3

rock-202402210000912562false00009125622024-02-212024-02-21

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) February 21, 2024 (February 21, 2024)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On February 21, 2024, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and twelve months ended December 31, 2023. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on February 21, 2024

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2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:February 21, 2024 By:/s/ Jeffrey J. Watorek Jeffrey J. Watorek Vice President and Treasurer

3

rock-202311020000912562false00009125622023-11-022023-11-02

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) November 2, 2023 (November 2, 2023)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On November 2, 2023, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and nine months ended September 30, 2023. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on November 2, 2023

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2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:November 2, 2023 By:/s/ Jeffrey J. Watorek Jeffrey J. Watorek Vice President and Treasurer

3

rock-202308020000912562false00009125622023-08-022023-08-02

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) August 2, 2023 (July 28, 2023)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On August 2, 2023, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and six months ended June 30, 2023. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangement of Certain Officers Adoption of Change in Control Executive Severance Plan On July 28, 2023, the Compensation and Human Capital Committee approved the Gibraltar Industries, Inc. Change in Control Executive Severance Plan (the "CIC Severance Plan"), effective as of July 28, 2023. The CIC Severance Plan provides severance pay and benefits to select employees who are Eligible Executives, as defined by the CIC Severance Plan, and whose employment is terminated on or after July 28, 2023. The CIC Severance Plan will be administered by the Compensation and Human Capital Committee of the Board (the “Committee”) and the Company’s Board of Directors may, in its discretion, exercise any or all such powers granted to the Committee under the CIC Severance Plan. Eligible Executives will be designated by the Committee, and will be required to enter into a participation agreement with the Company in order to participate in the CIC Severance Plan (the “Participation Agreement”). Capitalized terms used herein and not otherwise defined shall have the respective meanings given to them in the CIC Severance Plan. Upon a Qualifying Termination during the Change in Control Protection Period, participants in the CIC Severance Plan will be eligible to receive, subject to the execution of a release of claims, the following severance payments and benefits: •a total amount equal to (i) in the case of Eligible Executives other than the Chief Executive Officer of the Company (“CEO”), two times the sum of (a) twelve months’ worth of such Eligible Executive’s Base Salary plus (b) such Eligible Executive’s Target Annual Bonus, and (ii) in the case of the CEO, two-and-a-half times the sum of (y) twelve months’ worth of the CEO’s Base Salary plus (z) the CEO’s Target Annual Bonus; and •a single lump sum payment in a total amount equal to (i) in the case of Eligi

rock-202305030000912562false00009125622023-05-032023-05-03

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) May 3, 2023 (May 3, 2023)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On May 3, 2023, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three months ended March 31, 2023. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on May 3, 2023

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2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:May 3, 2023 By:/s/ Jeffrey J. Watorek Jeffrey J. Watorek Vice President and Treasurer

3

rock-202302220000912562false00009125622023-02-222023-02-22

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) February 22, 2023 (February 22, 2023)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On February 22, 2023, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and twelve months ended December 31, 2022. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on February 22, 2023

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2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:February 22, 2023 By:/s/ Jeffrey J. Watorek Jeffrey J. Watorek Vice President and Treasurer

3

rock-202301310000912562false00009125622023-01-312023-01-31

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) January 31, 2023 (January 31, 2023)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition On January 31, 2023, Gibraltar Industries, Inc. (the “Company”) issued a news release announcing a charge related to its processing equipment business that was classified as held for sale as of March 31, 2022 along with select preliminary estimated unaudited consolidated financial results for the twelve months ended December 31, 2022, and the date for its fourth quarter conference call. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K, including the Release, is furnished pursuant to Item 2.02 of Form 8-K and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Press Release issued by Gibraltar Industries, Inc. on January 31, 2023

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2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:January 31, 2023 By:/s/ Timothy F. Murphy Timothy F. Murphy Senior Vice President and Chief Financial Officer

3

rock-202211030000912562false00009125622022-11-032022-11-03

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) November 3, 2022 (November 3, 2022)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On November 3, 2022, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and nine months ended September 30, 2022. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on November 3, 2022

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:November 3, 2022 By:/s/ Jeffrey J. Watorek Jeffrey J. Watorek Vice President and Treasurer

3

rock-202208030000912562false00009125622022-08-032022-08-03

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) August 3, 2022 (August 3, 2022)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On August 3, 2022, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and six months ended June 30, 2022. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on August 3, 2022

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:August 3, 2022 By:/s/ Jeffrey J. Watorek Jeffrey J. Watorek Vice President and Treasurer

3

rock-202205040000912562false00009125622022-05-042022-05-04

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) May 4, 2022 (May 3, 2022)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On May 4, 2022, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three months ended March 31, 2022. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 8.01 Other Events On May 3, 2022, the Board of Directors of the Company authorized a share repurchase program, pursuant to which the Company is authorized to repurchase up to $200 million of the Company's issued and outstanding common stock over a three-year period ending May 2, 2025. Repurchases of common stock under the repurchase program may be made, from time to time, in amounts and at prices the Company deems appropriate, subject to market conditions, applicable legal requirements, debt covenants and other considerations. Any such repurchases may be executed using open market purchases, privately negotiated agreements or other transactions, and may be funded from cash on hand, supplemented by available borrowings under the existing credit facility. A copy of the news release is furnished herewith as Exhibit 99.2 and is incorporated herein by reference.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on May 4, 2022

99.2 Press Release issued by Gibraltar Industries, Inc. on May 4, 2022

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:May 4, 2022 By:/s/ Jeffrey J. Watorek Jeffrey J. Watorek Vice President and Treasurer

3

rock-202202230000912562false00009125622022-02-232022-02-23

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported) February 23, 2022 (February 22, 2022)

GIBRALTAR INDUSTRIES, INC.

(Exact name of registrant as specified in its charter)

Delaware000-2246216-1445150 (State or other jurisdiction of incorporation )(Commission File Number)(IRS Employer Identification No.)

3556 Lake Shore Road P.O. Box 2028 Buffalo, New York 14219-0228 (Address of principal executive offices) (Zip Code) (716) 826-6500 (Registrant’s telephone number, including area code) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: ☐     Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) ☐     Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) ☐     Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) ☐     Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) Securities registered pursuant to Section 12(b) of the Act:

Title of each classTrading SymbolName of each exchange on which registered Common Stock, $0.01 par value per shareROCKNASDAQ Stock Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter). Emerging growth company ☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition The following information is furnished pursuant to Item 2.02: On February 23, 2022, Gibraltar Industries, Inc. (the “Company”) issued a news release and will hold a conference call regarding financial results for the three and twelve months ended December 31, 2021. A copy of the news release (the “Release”) is furnished herewith as Exhibit 99.1 and is incorporated herein by reference. The information in this Form 8-K under the caption Item 2.02, including the Release, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”) or otherwise subject to liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended (the “Securities Act”) or the Exchange Act, unless the Company specifically incorporates it by reference in a document filed under the Securities Act or the Exchange Act.

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

On February 22, 2022, the Board of Directors of the Company appointed Katherine E. Bolanowski, the Company's General Counsel, as its Vice President, Secretary, effective immediately. Prior to her appointment, Jeffrey J. Watorek served as the Company's Secretary since April 2017. Mr. Watorek continues to serve as the Company's Vice President and Treasurer.

Item 9.01    Financial Statements and Exhibits (a)-(c)    Not Applicable (d)    Exhibits:

Exhibit No.Description 99.1 Earnings Release issued by Gibraltar Industries, Inc. on February 23, 2022

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2

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

GIBRALTAR INDUSTRIES, INC.

Date:February 23, 2022 By:/s/ Jeffrey J. Watorek Jeffrey J. Watorek Vice President and Treasurer

3